Naturally contaminated bovine bulk tank milk (n = 44) and feces (n = 39) were tested for the presence of viable Mycobacterium avium subsp. paratuberculosis by a novel peptide-mediated magnetic separation-phage (PMS-phage) assay. Counts of viable M. avium subsp. paratuberculosis cells ranging from 1 to 110 PFU/50 ml of milk and 6 to 41,111 PFU/g of feces were indicated by the PMS-phage assay.
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Foddai et al. (2011) studied this question.
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